Re: jumbo-frames on the network

From: Eli Dart (dart_at_nersc.gov)
Date: 01/29/04

  • Next message: Don Bowman: "RE: DEVICE_POLLING with SMP" 
    To: Don Lewis <truckman@FreeBSD.org>
Date: Thu, 29 Jan 2004 08:40:01 -0800

    In reply to Don Lewis <truckman@FreeBSD.org> :

    > On 28 Jan, Garrett Wollman wrote:
    > > <<On Wed, 28 Jan 2004 20:49:02 -0500, mi+mx@aldan.algebra.com said:
    > >
    > >> Can different MTUs be mixed on the same wire
    > >
    > > No.
    >
    > It's ugly, but I wonder if adding host routes with the -lock -mtu
    > options might work ...

    I wouldn't even mess with it. If you have an MTU mismatch on the
    same layer-2 domain, you have a Broken Network. If you manage to
    make it work with duct tape and zip ties, you're only setting
    yourself up for operational pain down the road. Just put a layer-3
    hop in between your standard frame and jumbo frame hosts, and you're
    good to go.

    The other thing people often do is block all ICMP because "ICMP is
    bad" and then wonder why path MTU discovery breaks :P

                    --eli

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